I don't mean fighting with Spectral Hand. In patch 1.50 I cannot hit the enemy with a weapon and stay invisible.
In 1.60 my testchar has level one of shadow veil. And it stays invisible even after castimg a lot of Skeletal Fortifications or direct killing the enemy with a sword.
There seems to be a problem with the Shadow Veil combat art of the Shadow Warior. I used the gold modification Sinister Pact, and now my char stay invisible until I deactivate the buff manually. Even in close combat he stays invisible.